To interrelate means to connect with or depend on other things in a network of relationships. When things interrelate, they affect each other and work together as parts of a larger system.

In an ecosystem, plants, animals, weather, and soil all interrelate. The rain affects the plants, the plants feed the animals, the animals fertilize the soil, and the soil helps new plants grow. Change one element, and you change the others. Scientists studying how these pieces interrelate can predict what might happen if, say, a new species arrives or rainfall decreases.

In your own life, your choices interrelate too. The sleep you get affects how well you focus in school. Your focus affects your grades. Your grades might affect your mood. Your mood affects how you treat your friends. Everything connects to everything else, even when those connections aren't obvious at first.

The word often appears as an adjective: interrelated. When a teacher explains how math concepts are interrelated, she's showing how fractions connect to decimals, which connect to percentages. Understanding one helps you understand the others. Things that interrelate don't exist in isolation. They're woven together like threads in fabric, each one strengthening and shaping the whole.